c NCTF
f g a c d e f f g h a b c d d e f
f g g
h h h a a a b b b b b b b b b b b
a a a
a h h h g g f f e d d c b b
a h g
f e b a a b b b a g e d b h f
d b h
f d b h f d b g e b h f c a f
d a g
d a g d a f c a e b g e a f c
h e a
f c h d h e a f b f c g c g c
g c h
d h c g c g c f b f a e a d h
c f b
